Microworld

world of amoeboid organisms

from Penard, 1917

 

Microcorycia tessellata (Penard, 1917) Chardez, 1965

Diagnosis: Upper test part apiculate or more dome-shaped, reinforced by four to six radially arranged costae that divide into two branches after covering a straight distance. Costae may also be arranged more or less irregularly and reticularly connected. The upper test part is mostly hyaline, rarely pale brownish, also greenish or yellowish (Penard 1917). Costae may be differently developed. More distinctly developed costae are brownish. At high magnification, it can be recognized that costae are covered with small russet spots (Penard 1917).

Dimensions: Penard (1917): 28-35 µm , also up to 40 µm; according to my own measurements of 66 individuals from five specimen series: X = 38.8 (29-49) µm. Cytoplasm is greyish. It contains innumerable granules as well as food particles and excreta. Contractile vacuoles in varying numbers occur at its upper periphery. In rare cases it can be seen that the cytoplasm is attached to the upper test part by means of epipodia. A widely rotund pseudopodium spread flat on the ground is extruded now and then. The cell is mononuclear (Penard 1917).

Remarks: Penard (1917) described the species with radially arranged (in a stellate or rosulate way) and bipartite costae as Corycia tessellata. However, he had also found individuals with irregularly running costae for which he did not preclude the status of a species of its own. I have not been able to find discontinuity between features of both forms.

Ecology: Moss (Penard 1917), xerophile moss (Badewitz 2003). Europe: Switzerland (Penard 1917), Germany (Badewitz 2003).

all from Badewitz (2004)

from Badewitz (2004)
Ferry Siemensma, created March 1, 2019; last modified January 31, 2021
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